Implement preloader in website

Question

I have created this animation and I would like to use it as a preloader. Am I able to use an animation that is structured by html,css and js or should I create a .gif or a simple css animation? If I can use it, how can I implement it in my website? I have seen a few tutorials where most people create a css animation and call the class to body and such, my issues is a different story.

var bar = $('span');
var p = $('.noumero');

var width = bar.attr('style');
width = width.replace("width:", "");
width = width.substr(0, width.length-1);

var interval;
var start = 0; 
var end = parseInt(width);
var current = start;

var countUp = function() {
  current++;
 p.html(current);

 if (current === end) {
  clearInterval(interval);
 }
 };

 interval = setInterval(countUp, (2000 / (end + 1)));

div.meter {
 position: relative;
 width: 400px;
 height: 4px;
 margin-top: 50px;
}

div.meter span {
 display: block;
 height: 100%;
 animation: grower 1.8s linear;
 -moz-animation: grower 1.8s linear;
 -webkit-animation: grower 1.8s linear;
 -o-animation: grower 1.8s linear;
 position: relative;
 top: -1px;
 left: -1px;
 background-color:rgba(255,0,0,1);
 -webkit-background-size: 45px 45px;
 -moz-background-size: 45px 45px;
 -o-background-size: 45px 45px;
 background-size: 45px 45px;
 }

.theR{
 float:left; 
 font-size:24px; 
 font-weight:bold;
 color:rgba(255,0,0,1);
 float:left; 
 display:block;
 margin-top:0px;
 font-family: 'Montserrat', sans-serif;
 }

.the255{
 float:left; 
 font-size:24px; 
 font-weight:bold;
 color:rgba(255,0,0,1); 
 float:left; 
 display:block; 
 margin-top:0px;
 font-family: 'Montserrat', sans-serif;
 }

.theline{
 width:255px; 
 float:left; 
 font-size:24px; 
 font-weight:bold; 
 color:red; 
 float:left; 
 display:block;
 }

@keyframes grower {
  0% {
    width: 0%;
   }
  }

@-moz-keyframes grower {
  0% {
    width: 0%;
  }
}

@-webkit-keyframes grower {
  0% {
    width: 0%;
 }
}

@-o-keyframes grower {
 0% {
   width: 0%;
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class="meter">
  <p class="theR">R</p>  
  <span style="width:255px;" class="theline"></span>
   <p class="noumero the255"></p>  
</div>
<div style="clear:both"></div>

Answer 1

You can set content of document to be displayed to display:none at css; use $.holdReady() to hold .ready() handlers; .fadeToggle() to fade out .meter element when animation completes and fade in content of document once .fadeToggle() of .meter container completes

$.holdReady(true);

var bar = $('span');
var p = $('.noumero');

var width = bar.attr('style');
width = width.replace("width:", "");
width = width.substr(0, width.length - 1);

var interval;
var start = 0;
var end = parseInt(width);
var current = start;

var countUp = function() {
  current++;
  p.html(current);

  if (current === end) {
    clearInterval(interval);
    $(".meter").fadeToggle(500, function() {
      $.holdReady(false);
    })
  }
};

interval = setInterval(countUp, (2000 / (end + 1)));

$(document).ready(function() {
  $(".content").fadeToggle(5000)
})

div.meter {
  position: relative;
  width: 400px;
  height: 4px;
  margin-top: 50px;
}
div.meter span {
  display: block;
  height: 100%;
  animation: grower 1.8s linear;
  -moz-animation: grower 1.8s linear;
  -webkit-animation: grower 1.8s linear;
  -o-animation: grower 1.8s linear;
  position: relative;
  top: -1px;
  left: -1px;
  background-color: rgba(255, 0, 0, 1);
  -webkit-background-size: 45px 45px;
  -moz-background-size: 45px 45px;
  -o-background-size: 45px 45px;
  background-size: 45px 45px;
}
.theR {
  float: left;
  font-size: 24px;
  font-weight: bold;
  color: rgba(255, 0, 0, 1);
  float: left;
  display: block;
  margin-top: 0px;
  font-family: 'Montserrat', sans-serif;
}
.the255 {
  float: left;
  font-size: 24px;
  font-weight: bold;
  color: rgba(255, 0, 0, 1);
  float: left;
  display: block;
  margin-top: 0px;
  font-family: 'Montserrat', sans-serif;
}
.theline {
  width: 255px;
  float: left;
  font-size: 24px;
  font-weight: bold;
  color: red;
  float: left;
  display: block;
}
@keyframes grower {
  0% {
    width: 0%;
  }
}
@-moz-keyframes grower {
  0% {
    width: 0%;
  }
}
@-webkit-keyframes grower {
  0% {
    width: 0%;
  }
}
@-o-keyframes grower {
  0% {
    width: 0%;
  }
}

.content {
  display:none;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class="meter">
  <p class="theR">R</p>
  <span style="width:255px;" class="theline"></span>
  <p class="noumero the255"></p>
</div>
<div style="clear:both"></div>
<div class="content">
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</div>